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Submerged Coils - Heat Transfer Coefficients

Heat transfer coefficients for steam and hot water coils submerged in oil tanks

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Oil tank - heating coils

The overall heat transfer coefficients for steam coils with medium pressure -  or hot water coils or pipes -  submerged in oil or fat:

Type of CoilHeat Transfer Coefficient
- U -
(W/m2 oC)(Btu/hr ft2 oF)
Steam to Aqueous Solutions, agitated 800 - 1200 140 - 210
Steam to Aqueous Solutions, natural convection 340 - 570 60 - 100
Steam to Light Oil, natural convection 170 30
Steam to Heavy Oil, natural convection 85 - 115 15 - 20
Steam to Heavy Oil, agitated 140 - 310 25 - 55
Steam to Fat, natural convection 30 - 60 5 - 10
Steam to Organics, agitated 510 - 800 90 - 140
Hot Water to Oil, natural convection 34 - 140 6 - 25
Hot Water to Water, natural convection 200 - 370 35 - 65
Hot Water to Water, agitated 480 - 850 90 - 150
Heat transfer oil to Organics, agitated 140 - 280 25 - 50
Salt brine to Water, agitated 280 - 630 50 - 110
Cooling Water to Glycerine, agitated 280 - 430 50 - 75

Example - Heat Transfer from a Steam Coil

A 50 mm steam coil with outside diameter 60.3 mm (0.0603 m) and length 10 m with 1 bar absolute pressure and steam temperature 120 oC is submerged in an oil bath with temperature 50 oC.

The surface area of the coil can be calculated by multiplying the pipe circumference with pipe length as

A = π (0.0603 m) (10 m)

   = 1.89 m2

From the table above the heat transfer coefficient is 170 W/m2 oC for "Steam to Light Oil, Natural Convection". The heat transfer can be calculated as

Q = (1.89 m2)((120 oC) - (50 oC))(170 W/m2 oC)

   = 22491 W  

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